Évaluation des coûts de déplacement de la martre d'Amérique dans une sapinière boréale aménagée
In contrast to the ideal free distribution (Fretwell and Lucas 1969) framework, animals have to face numerous constraints when moving through landscapes. However, these constraints have rarely been integrated, let alone quantified, into habitat selection studies. Spatially-explicit models are increa...
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2009
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fttriple:oai:gotriple.eu:http://hdl.handle.net/20.500.11794/21041 2023-05-15T17:10:25+02:00 Évaluation des coûts de déplacement de la martre d'Amérique dans une sapinière boréale aménagée Assessment of the travel costs of the American martre in an upgraded Boreal Sapinière Planckaert, Ophelie Desrochers, André Québec (Province) 2009-01-01 https://hdl.handle.net/20.500.11794/21041 fr fre Université Laval http://hdl.handle.net/20.500.11794/21041 CorpusUL envir geo Thesis https://vocabularies.coar-repositories.org/resource_types/c_46ec/ 2009 fttriple https://doi.org/20.500.11794/21041 2023-01-22T17:29:50Z In contrast to the ideal free distribution (Fretwell and Lucas 1969) framework, animals have to face numerous constraints when moving through landscapes. However, these constraints have rarely been integrated, let alone quantified, into habitat selection studies. Spatially-explicit models are increasingly used to make predictions about distribution of animal populations, but they are based on subjective estimations of movement parameters such as resistance to movement and perceptual range. Finally, most ecologists studying movements collect data by radio-telemetry, but this is an expensive method to which alternatives exist. The objectives of this study were to (1) develop an inexpensive approach to analyze movements from spatial distribution data, and (2) estimate value of two parameters (movement resistance and perceptual range) integrated in simulation models of American martens (Martes americana). Every winter from 2004 to 2008, marten tracks were located by snow-tracking. For each year, I designed 150 movement resistance scenarios differing by three spatial resolutions (5 m, 25 m, and 100 m), 10 resistance factors in open areas (range 4-1000), and five scenarios differing by edge effect and relative movement cost in young stands (age 11-30 y). With a Geographical Information System (GIS), ‘least-cost’ paths were generated across the study area, according to each cost scenario. Nearest-neighbor distances between points where simulated paths met transects and real marten tracks were used to assess simulation performance. In 78 % of cases (45 % significant), resistance scenarios performed better than corresponding null models (equal resistance in all habitats), suggesting that mosaic structure of our study area did limit movements of American martens. Adding intermediate movement values for young forests increased simulation performance to 93 % (53 % significant), suggesting that movement resistance in young stands was higher than in mature forest. All simulations with a pixel size of 100 m performed ... Thesis Martes americana Unknown |
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envir geo |
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envir geo Planckaert, Ophelie Évaluation des coûts de déplacement de la martre d'Amérique dans une sapinière boréale aménagée |
topic_facet |
envir geo |
description |
In contrast to the ideal free distribution (Fretwell and Lucas 1969) framework, animals have to face numerous constraints when moving through landscapes. However, these constraints have rarely been integrated, let alone quantified, into habitat selection studies. Spatially-explicit models are increasingly used to make predictions about distribution of animal populations, but they are based on subjective estimations of movement parameters such as resistance to movement and perceptual range. Finally, most ecologists studying movements collect data by radio-telemetry, but this is an expensive method to which alternatives exist. The objectives of this study were to (1) develop an inexpensive approach to analyze movements from spatial distribution data, and (2) estimate value of two parameters (movement resistance and perceptual range) integrated in simulation models of American martens (Martes americana). Every winter from 2004 to 2008, marten tracks were located by snow-tracking. For each year, I designed 150 movement resistance scenarios differing by three spatial resolutions (5 m, 25 m, and 100 m), 10 resistance factors in open areas (range 4-1000), and five scenarios differing by edge effect and relative movement cost in young stands (age 11-30 y). With a Geographical Information System (GIS), ‘least-cost’ paths were generated across the study area, according to each cost scenario. Nearest-neighbor distances between points where simulated paths met transects and real marten tracks were used to assess simulation performance. In 78 % of cases (45 % significant), resistance scenarios performed better than corresponding null models (equal resistance in all habitats), suggesting that mosaic structure of our study area did limit movements of American martens. Adding intermediate movement values for young forests increased simulation performance to 93 % (53 % significant), suggesting that movement resistance in young stands was higher than in mature forest. All simulations with a pixel size of 100 m performed ... |
author2 |
Desrochers, André |
format |
Thesis |
author |
Planckaert, Ophelie |
author_facet |
Planckaert, Ophelie |
author_sort |
Planckaert, Ophelie |
title |
Évaluation des coûts de déplacement de la martre d'Amérique dans une sapinière boréale aménagée |
title_short |
Évaluation des coûts de déplacement de la martre d'Amérique dans une sapinière boréale aménagée |
title_full |
Évaluation des coûts de déplacement de la martre d'Amérique dans une sapinière boréale aménagée |
title_fullStr |
Évaluation des coûts de déplacement de la martre d'Amérique dans une sapinière boréale aménagée |
title_full_unstemmed |
Évaluation des coûts de déplacement de la martre d'Amérique dans une sapinière boréale aménagée |
title_sort |
évaluation des coûts de déplacement de la martre d'amérique dans une sapinière boréale aménagée |
publisher |
Université Laval |
publishDate |
2009 |
url |
https://hdl.handle.net/20.500.11794/21041 |
op_coverage |
Québec (Province) |
genre |
Martes americana |
genre_facet |
Martes americana |
op_source |
CorpusUL |
op_relation |
http://hdl.handle.net/20.500.11794/21041 |
op_doi |
https://doi.org/20.500.11794/21041 |
_version_ |
1766067002442514432 |